12
IDSL LINE DRIVER W/V.35 OR X.21
NOTE
The IDSL Line Driver can also operate at the 19.2 kbps synchronous
rate. To operate at 19.2 synchronous, set Switches S1-1 and S1-2 both
to the OFF position and Switch S2-1 to the ON position (see Section
3.2.1 for a description of Switch S2-1).
3.1.2 S
WITCH
S1-3: D
ATA
S
ET
R
EADY
D
URING
L
INE
L
OOPBACK
T
EST
Use Switch S1-3 to control the behavior of the DSR signal at the EIA interface
during the line loopback test.
Table 3-3. Data Set Ready switch setting.
S-3
Setting
On
DSR is on during local line loop
Off
DSR is off during local line loop
3.1.3 S
WITCH
S1-4: M
UST
B
E
S
ET TO THE
ON P
OSITION
(R
ESERVED
)
Table 3-4. Switch S1-4 setting.
S1-4
Setting
On
Reserved
3.1.4 S
WITCH
S1-5: A
SYNCHRONOUS
/S
YNC
O
PERATION
Use Switch S1-5 to configure the IDSL Line Driver for async/sync operation.
Switch S1-5 must be set in the Off position. There is no other valid setting.
Table 3-5. Async/sync operation.
S1-5
Setting
Off
Async/Sync
